XC68HC705JJ7 Motorola, XC68HC705JJ7 Datasheet - Page 188

• Manufacturer Part Number: XC68HC705JJ7
• Description: MICROCONTROLLER
• Manufacturer: Motorola

EPROM/OTPROM
13.3.3 EPROM Security Bit
Advance Information
188
Address:
Figure 13-3. EPROM Security in COP and Security Register (COPR)
Erased:
Reset:
COPEN — COP Watchdog Enable Bit
An EPROM programmable bit is provided at the location of the COP
watchdog register at $1FF0 as shown in
control of access to the EPROM array. Any accesses of the EPROM
locations will return undefined results when the EPMSEC bit is set. Refer
to
EPMSEC — EPROM Security
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or
Read:
Write:
copying the EPROM/OTPROM difficult for unauthorized users.
13.4.2 EPMSEC Programming
This EPROM bit enables the COP watchdog.
This EPROM write-only bit enables the access to the EPROM array.
1 = COP watchdog enabled
0 = COP watchdog disabled
1 = Access to the EPROM array in non-user modes is denied.
0 = Access to the EPROM array in non-user modes is enabled.
$1FF0
EPMSEC
Bit 7
0
EPROM/OTPROM
OPT
—
6
= Unimplemented
—
5
1
Unaffected by reset
MC68HC705JJ7 • MC68HC705JP7 — REV 4
—
4
for programming instructions.
Figure
—
3
13-3. This bit allows
—
2
—
1
MOTOROLA
COPC
Bit 0
—